Chisel



L. R. RUHL CHISEL Filed Feb. 20, 1929 Au'g. 12, 1930.

o. WN WN \N w NN WN QN n N www N1 Y www H,\.\ \\\\\\w\\\\\\\\\\\\\\ Nil( NN mx* Patented Aug. l2, 1930 UNITED STATES LESTER B.. RUHL, OF MIFFLINBURG, PENNSYLVANIA.

C'HISEL Application led February 20, 1929.

This invention is a tool for removmg the sealing compound which is generally ernployed between the walls of a storage battery box or case and the cover of the case. The

general practice at present is to heat the storage battery box so as to soften the sealing compound or melt the same sufficiently to permit it to be easily pried out of place but no tool has been provided so far as I am aware for accomplishing the work in a neat expeditious manner. 1f an open flame be employed, explosions are very apt to occur inasmuch as the gas generated within the battery box will escape through the space opened between the lid and the box and reaching the open flame will be. fired. Soft metal tools are apt to bend when pressure is put upon them so that they are unsatisfactory when employed for this purpose and,

furthermore, scatter the sealing material so that the battery box is marred and smeared and the job is unsatisfactory to the cusf tomer. The present invention provides a simple and inexpensive tool which is highly eicient in removing the sealing compound from between the battery box and its cover and may be used readily without marring the box or the cover by unduly spreading the softened compound. The invention is illustrated in the accompanying drawing and will be hereinafter fully set forth.

In the drawing:

Figure 1 is a perspective view of a tool embodying the invention.

Fig. 2 is a longitudinal section of the same, and

Fig. 3 is a detail view of the heating element as it appears before being finished and fitted in the tool.

In carrying out the present invention, there is provided a shank 1 consisting of a brass tube which may be nickel-plated or otherwise finished so as to have an attractive appearance. One end 0f this tube is closed, i as shown at 2, while the other end is open and slightly flared, as shown at 3. To the closed end of the tube is applied a tongue or blade 4 of tempered steel having a tapered or sharpened extremityy 5. This blade is rather thin and narrow so that it may be eas- Serial No. 341,458.

ily applied to the compound which is to be removed and will fit readily between the cover and the box as the compound is removed. The blade or bit is welded to the closed end of the shank 1 by a bronze weld, indicated at 6, this construction being very efficient inasmuch as it intimately unites the blade or bit to the shank and permits the use of a hard metal bit which will withstand the pressure exerted through it when in use and will also withstand the application of heat more eectually than untempered steel. Moreover, the acid within the opened box will not deleteriously affect the tempered steel and the bronze weld to the same extent Vthat it a'i'ects other metals 'ormaterials frequently employed. A handle v7 of wood or other insulating material is fitted to and about the open end of the shank 1, as clearly shown in Fig. 2, and one end of this handle is reduced, as shown at 8, and equipped with a metal ferrule 9 so as to be protected against splitting. A set screw 10 is provided to removably secure the handle to the tubular i shank. The outer end of the handle is open y toprovide a chamber 11 accommodating the fconnection `between the heating element and the conducting cable 12, said cable being equipped with a plug (not shown) of wellknown form whereby it may be fitted in an electric light socket or other convenient source of electric energy so as to transmit current to the heating element 13. The chamber 11 pro* vides. ample room for thev accommodation of taped connections, indicated at 14, and, to

Fig. 3, it will be noted that the turnsor coils i of the winding are spaced relatively widely in the end portions of the element and more `closely spaced, as shown at 19, toward the center.l Thev center of the length ofthe wire is disposed longitudinally of the core for a short distance, as indicated at 20, and

When the element has been complete-d, it is doubled on itself at this point, as indicated at 2l in Fig. 2, so that the ends of the Wind- 5 ing Will be brought close together and may be connected into the Wires of the cable l2 by tape or like ineans, as shown. It will be noted thatthe folded heating elei'nent will fit closely 'within the shank l and the flared lo end of the shank facilitates the insertion of the heating eleinent therein.

Tlhen the tool is to be used, the cable 12 is connected into a light socket or other source of supply and the Winding 17 will l5 constitute a resistance so that it Will become heated and the heat ivill be transmitted to the blade el. The spacing of the Winding is such that relatively little heat will be given out Within the handle While the heat Will be 2O concentrated at the point of the tool and Will act in the desired inanner upon the sealing conipound vvnich is to be reinoved. 'I he device avoids the use of open thune and the heat is applied entirely through the interior of the tool and is also applied continuously when in use so that it is not necessary to reheat the tool and suspend operations While the reheatiueis being accomplished. Therefore, the operator maf run the tool along the joint 30 between the battery box and its cover in an uninterrupted operation so that the cour pound will be quickly melted or softened and niay be picked out of the joint ivithout niarring the box or the cover or spreading unduly 35 over either the bon or the cover.

Having thus described the invention, I claini:

A tool for the purpose set forth coniprising a hollow nietallic shank having an open end, an open ended handle of insulating inaterial fitted around and secured to the open end of the shank and having a relatively enlarged chaniber alined ivith and in connnunication vfith the bore of the shank, a heating elenient insertible through the open end of the handle and the open end of the shank to be housed snugly vvithin the shank, said elenient including an insulating core, a Winding about the core having its coils spaced relatively Widely at the ends of the core and relatively closely at the center of the core, and a heat-resisting covering over the entire core and the Winding, the core With the Winding and the cover being doubled upon itself at its center to be inserted in the shank, a blade intimately permanently united With the closed end of the shank, a block secured Within the chainber of the handle, and a feeder cable extending through and supported by said block and united with the ends of the Winding Within the chaniber of the handle between said block and the end of the shank.

In testimony whereof I aliix iny signature.

Lnsfrnn n. RHL. 

